CN216517969U

CN216517969U - Engineering reconnaissance horizontal drilling water head test double plug seals at a distance from pressure apparatus

Info

Publication number: CN216517969U
Application number: CN202122859586.5U
Authority: CN
Inventors: 房勇; 李勇; 王军朝; 王汇明; 李军; 庄生明; 周天游; 黄玲
Original assignee: Guangdong Water Conservancy And Electric Power Survey Design And Research Institute Co ltd; Institute of Exploration Technology Chinese Academy of Geological Sciences
Current assignee: Guangdong Water Conservancy And Electric Power Survey Design And Research Institute Co ltd; Institute of Exploration Technology Chinese Academy of Geological Sciences
Priority date: 2021-11-22
Filing date: 2021-11-22
Publication date: 2022-05-13
Anticipated expiration: 2031-11-22

Abstract

The utility model discloses a double-plug packing pressure tester for a horizontal drilling water-pressure test in engineering investigation, which comprises an upper packing torque transmission mechanism, a flow discharge communication channel, a pressure measuring mechanism, a lower packing mechanism and a pressure relief mechanism, wherein the upper packing torque transmission mechanism comprises an upper joint, an upper central pipe, an upper spline joint, an upper spline sleeve, a top shear pin and a spline shaft, the bottom end of the upper joint is in threaded connection with the top end of the upper central pipe, the bottom end of the upper central pipe is in threaded connection with the top end of the spline shaft, the bottom end of the upper central pipe is in threaded connection with the upper spline joint, the bottom end of the upper spline joint is in threaded connection with the upper spline sleeve, the upper spline sleeve is connected with the spline shaft through a spline connection structure, and the spline connection structure is positioned by the top shear pin, the purpose of not lifting the drill in the midway is achieved, the auxiliary time for measuring the pressure is reduced, and the efficiency for measuring the pressure is improved.

Description

Engineering reconnaissance horizontal drilling water head test double plug seals at a distance from pressure apparatus

Technical Field

The utility model relates to the technical field of double-plug packing pressure measuring equipment, in particular to a double-plug packing pressure measuring instrument for a horizontal drilling water pressure test in engineering investigation.

Background

The water pressure test is an in-situ test for pressing water into a drill hole in a high-pressure mode and calculating and knowing the development condition and water permeability of a rock mass fracture according to the water absorption capacity of the rock mass. The drilling water-pressurizing test is used as a rock body in-situ test, is widely applied to measuring the permeability of a rock body in engineering investigation, can judge and analyze the permeability state information of the rock body in situ more intuitively, and provides basic data for evaluating the permeability of the rock body and designing permeability control measures.

The existing double-packing pressure measuring device in engineering exploration drilling is characterized in that after equipment is conveyed into a drilling hole through a drill string, a packing rubber cylinder is expanded through the pressure of the drill string, the effect of packing the drilling hole is achieved, then clear water is conveyed to a position to be measured through special water pressing equipment, and corresponding reading is carried out through a pressure gauge on the ground surface. The device is provided with a special water injection pipeline, and is easy to be blocked or damaged in the drilling process; the drilling tool is not provided with a torque transmission mechanism and a flushing fluid (slurry or clear water) drainage channel, the drilling tool (consisting of a drill rod column and a pressure measuring device) cannot be rotated when being blocked in the process of drilling down, the drilling tool can only be put down after being lifted up, and the drilling tool cannot still pass through a hole blocking section if being lifted up and put down for many times, and the drilling tool can only be lifted up and swept up and then put down into the pressure measuring device again; the pressure measuring device is similar to a piston in a drill hole, and when the drill hole is drilled too fast, the back pressure of the drilling tool with the pressure measuring device is large, so that the pressure measuring device cannot reach a specified position; when the drill is lifted, a drilling tool (consisting of a drill rod column and a pressure measuring device) similar to a piston generates a pumping effect in a drill hole, so that the collapse of the hole wall is induced, an accident in the hole is caused, and the whole drill hole is scrapped seriously; the pressure measurement is carried out by a pressure gauge on the earth surface, so that the pressure parameters in the hole cannot be directly reflected, and the precision is not high. Therefore, the pressure measuring device has certain defects.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a double-plug packing pressure tester for a horizontal borehole water-pressure test in engineering investigation, which aims to solve the problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides an engineering reconnaissance horizontal drilling pressurized-water test double plug seals and separates pressure apparatus, separates biography torsion mechanism, earial drainage intercommunication way, pressure measurement mechanism, seals down and separates mechanism and relief mechanism including last, on seal and separate biography torsion mechanism and include top connection, go up the center tube, go up spline joint, go up spline housing, top shear pin, integral key shaft, the bottom of top connection and the top threaded connection of last center tube, the bottom threaded connection of going up the center tube has last spline joint, the bottom threaded connection of going up spline joint has last spline housing, go up spline housing and spline shaft connection through spline connection, just spline connection is fixed a position by top shear pin, relief mechanism includes piston, spring, piston cap, check round pin, non return spiral shell lid, non return spring, suspension pin, seal nipple joint, the spline shaft is connected, The bottom of the inner cavity of the spline shaft is sleeved with an upper piston, the surface of the upper piston is sleeved with a spring, the top end of the middle adjusting rod is in threaded connection with the bottom end of the upper spline sleeve, the bottom end of the middle adjusting rod is in threaded connection with the top end of the middle joint, the bottom end of the spline shaft is in threaded connection with a piston cover, the bottom end of the piston cover is connected with a sealing piston, one side of the piston cover is provided with a radial hole, the inner cavity of the radial hole is sequentially provided with a non-return pin, a non-return screw cap and a non-return spring, the bottom end of the upper piston is connected with a sealing short section through a suspension pin, the bottom end of the sealing piston is in threaded connection with a sealing cavity, the bottom end of the sealing cavity is in threaded connection with a sealing end cover, the sealing piston, the sealing cavity and the sealing end cover enclose a cavity, and an electronic pressure gauge is fixedly mounted in the cavity and positioned at the top of the sealing end cover, the lower packing mechanism comprises a lower central tube, a lower spline sleeve joint, a lower spline sleeve, a bottom shear pin, a lower piston, a supporting tube and a lower joint, wherein the bottom end of the middle joint is in threaded connection with the lower central tube, the bottom end of the lower central tube is in threaded connection with the lower spline sleeve, the bottom end of the lower spline sleeve joint is in threaded connection with the lower spline sleeve, the lower spline sleeve is connected with the lower piston through a spline connecting structure, the spline connecting structure is positioned through the bottom shear pin, the bottom end of the lower spline sleeve is connected with the supporting tube, the bottom end of the supporting tube is connected with the lower joint, and a top guide ring, a rubber tube and a middle guide ring are sequentially sleeved on the surface of the upper central tube and the surface of the lower central tube from top to bottom.

Preferably, the inboard of a rubber section of thick bamboo is provided with indent ball cambered surface, the outside of a rubber section of thick bamboo is provided with the wire net, and the setting of the inboard indent ball cambered surface of a rubber section of thick bamboo and outside wire net has guaranteed that a rubber section of thick bamboo effectively expands and tightly supports on the pore wall under the effect of boring pressure, has increased the intensity of a rubber section of thick bamboo, has strengthened the packing effect.

Preferably, the earial drainage intercommunication way comprises earial drainage hole, earial drainage passageway and earial drainage way, earial drainage hole has all been seted up to one side of going up the center tube and one side of center tube down, earial drainage passageway has all been seted up to one side of going up spline joint and one side of lower spline socket, one side of going up spline housing and spline housing down is provided with six key internal splines, the one side of integral key shaft and lower piston is provided with the three key external splines, earial drainage way is formed by six key internal splines and the cooperation of three key external splines, has solved the piston effect in the play, the underdrill in-process, has eliminated the backpressure effect when drilling down, has prevented cutting in advance of top and bottom shear pin, has eliminated the suction effect when playing the brill, has reduced the destruction to the hole wall, makes work more reliable, reduces or has avoided downthehole accident.

Preferably, through holes are formed in the middle of the spline shaft, one side of the middle adjusting rod, one side of the sealing piston and one side of the sealing short section.

Preferably, a drilling fluid channel is formed in one side of the top of the upper piston.

Preferably, a drill rod connecting groove is formed in the top end of the upper joint, and a support rod connecting groove is formed in the bottom end of the lower joint and used for connecting the drill rod and the support rod.

Compared with the prior art, the utility model has the beneficial effects that:

the double-plug packing pressure tester for the engineering investigation horizontal drilling pressure test cancels a pipeline special for conveying slurry or clear water, and a spline connection structure for transmitting torque is added in a packing device of the tester, so that the problem of resistance caused by hole wall shrinkage or block falling in the drilling process is solved, the purpose of not lifting the drill in the midway is achieved, the auxiliary time for measuring the pressure is reduced, and the efficiency for measuring the pressure is improved; the arrangement of the drainage communicating channel solves the piston effect in the processes of drilling up and down, eliminates the backpressure effect in the drilling down process, prevents the shearing of the shearing pins at the top and the bottom in advance, eliminates the suction effect in the drilling up process, reduces the damage to the hole wall, ensures more reliable work and reduces or avoids the accidents in the hole; the arrangement of the cambered surface of the concave ball at the inner side of the rubber cylinder and the steel wire mesh at the outer side ensures that the rubber cylinder effectively expands and is tightly supported on the hole wall under the action of drilling pressure, the strength of the rubber cylinder is increased, and the packing effect is enhanced; the rubber cylinder can be quickly restored to the original state when the bit pressure is removed, so that the drill can be conveniently pulled out in time; the adoption of the electronic pressure gauge improves the accuracy of pressure measurement and shortens the time for reading pressure data.

Drawings

FIG. 1 is a block diagram of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a cross-sectional view B-B of FIG. 1;

FIG. 4 is an enlarged partial view of portion C of FIG. 1;

FIG. 5 is a block and bore operational block diagram of the present invention;

fig. 6 is a structural view of the pressure relief and pressure measurement operation of the present invention.

In the figure: 1. an upper joint; 2. a top pilot ring; 3. a rubber cylinder; 4. a middle pilot ring; 5. an upper center tube; 6. a vent hole; 7. an upper spline joint; 8. a bleed passage; 9. an upper spline housing; 10. a top shear pin; 11. a spline shaft; 12. a flow relief channel; 13. an upper piston; 14. a spring; 15. a piston cap; 16. a non-return pin; 17. a non-return screw cap; 18. a check spring; 19. a suspension pin; 20. sealing the short section; 21. a radial bore; 22. an inner concave spherical arc surface; 23. a sealing piston; 24. an electronic pressure gauge; 25. sealing the cavity; 26. a six-key internal spline; 27. sealing the end cap; 28. a triple bond external spline; 29. a middle adjusting rod; 30. a middle joint; 31. A lower center tube; 32. connecting grooves of the drill rods; 33. a lower spline socket joint; 34. a support rod connecting groove; 35. a lower spline housing; 36. a bottom shear pin; 37. a lower piston; 38. supporting a tube; 39. and a lower joint.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, the utility model provides a double-plug packing pressure tester for engineering investigation horizontal borehole water-pressure test, comprising an upper packing and torque-transmitting mechanism, a drainage communication channel, a pressure measuring mechanism, a lower packing and torque-transmitting mechanism and a pressure relief mechanism, wherein the upper packing and torque-transmitting mechanism comprises an upper joint 1, an upper central tube 5, an upper spline joint 7, an upper spline housing 9, a top shear pin 10 and a spline shaft 11, the bottom end of the upper joint 1 is in threaded connection with the top end of the upper central tube 5, the bottom end of the upper central tube 5 is in threaded connection with the top end of the spline shaft 11, the bottom end of the upper central tube 5 is in threaded connection with the upper spline joint 7, the bottom end of the upper spline joint 7 is in threaded connection with the upper spline housing 9, the upper spline housing 9 is connected with the spline shaft 11 through a spline connection structure, the spline connection structure is positioned by the top shear pin 10, the pressure relief mechanism comprises an upper piston 13, a spring 14 and a piston cover 15, The sealing device comprises a non-return pin 16, a non-return screw cap 17, a non-return spring 18, a suspension pin 19, a sealing short section 20, a sealing piston 23, a sealing cavity 25, a sealing end cover 27, an intermediate adjusting rod 29 and a middle joint 30, wherein the bottom of the inner cavity of a spline shaft 11 is sleeved with an upper piston 13, the surface of the upper piston 13 is sleeved with a spring 14, the top end of the intermediate adjusting rod 29 is in threaded connection with the bottom end of an upper spline sleeve 9, the bottom end of the intermediate adjusting rod 29 is in threaded connection with the top end of the middle joint 30, the bottom end of the spline shaft 11 is in threaded connection with a piston cap 15, the bottom end of the piston cap 15 is connected with the sealing piston 23, one side of the piston cap 15 is provided with a radial hole 21, the inner cavity of the radial hole 21 is sequentially provided with the non-return pin 16, the non-return screw cap 17 and the non-return spring 18, the bottom end of the upper piston 13 is connected with the sealing short section 20 through the suspension pin 19, the bottom end of the sealing piston 23 is in threaded connection with the sealing cavity 25, and the bottom end of the sealing cavity 25 is in threaded connection with the sealing end cover 27, the sealing piston 23, the sealing cavity 25 and the sealing end cover 27 enclose a cavity, an electronic pressure gauge 24 is fixedly mounted inside the cavity and at the top of the sealing end cover 27, the lower packing mechanism comprises a lower central tube 31, a lower spline sleeve joint 33, a lower spline sleeve 35, a bottom shear pin 36, a lower piston 37, a support tube 38 and a lower joint 39, the bottom end of the middle joint 30 is in threaded connection with the lower central tube 31, the bottom end of the lower central tube 31 is in threaded connection with the lower spline sleeve 35, the bottom end of the lower spline sleeve joint 33 is in threaded connection with the lower spline sleeve 35, the lower spline sleeve 35 and the lower piston 37 are connected through a spline connection structure, the spline connection structure is positioned through the bottom shear pin 36, the bottom end of the lower spline sleeve 35 is connected with the support tube 38, the bottom end of the support tube 38 is connected with the lower joint 39, the top guide ring 2 is sequentially sleeved on the surface of the upper central tube 5 and the surface of the lower central tube 31 from top to bottom, A rubber cylinder 3 and a middle pilot ring 4.

The inner side of the rubber cylinder 3 is provided with an inner concave spherical cambered surface 22, and the outer side of the rubber cylinder 3 is provided with a steel wire mesh.

During the use, the setting of the inboard indent ball cambered surface 22 of rubber tube 3 and outside wire net has guaranteed that rubber tube 3 effectively expands and tightly supports on the pore wall under the weight on bit effect, has increased the intensity of rubber tube 3, has strengthened the packing effect.

The discharge communicating channel is composed of a discharge hole 6, a discharge channel 8 and a discharge channel 12, the discharge hole 6 is formed in one side of the upper central tube 5 and one side of the lower central tube 31, the discharge channel 8 is formed in one side of the upper spline joint 7 and one side of the lower spline sleeve joint 33, the six-key internal spline 26 is arranged on one side of the upper spline sleeve 9 and one side of the lower spline sleeve 35, the three-key external spline 28 is arranged on one side of the spline shaft 11 and one side of the lower piston 37, and the discharge channel 12 is formed by matching the six-key internal spline 26 and the three-key external spline 28.

When the drilling tool is used, the arrangement of the drainage communication channel solves the piston effect in the drilling process, eliminates the backpressure effect in the drilling process, prevents the top and bottom shear pins 36 from being cut off in advance, eliminates the suction effect in the drilling process, reduces the damage to the hole wall, ensures that the operation is more reliable, and reduces or avoids the accidents in the hole.

Through holes are formed in the middle of the spline shaft 11, one side of the middle adjusting rod 29, one side of the sealing piston 23 and one side of the sealing short section 20, and a drilling fluid channel is formed in one side of the top of the upper piston 13.

When the device is used, slurry or clean water enters a drilling position to be measured (namely a sealing position of the rubber cylinder 3) through an aligned through hole in the axial direction of the upper piston 13 and the spline shaft 11, enters the sealing cavity 25 through the aligned through hole, and is recorded with downward pressure data by the electronic type downhole electronic pressure gauge 24, so that the purpose of measuring pressure is achieved.

The top end of the upper joint 1 is provided with a drill rod connecting groove 32, and the bottom end of the lower joint 39 is provided with a support rod connecting groove 34.

During the use, let the upper end of top connection 1 pass through the lower extreme of drilling rod spread groove 32 and drill string and be connected, let the lower extreme of bottom connection 39 pass through bracing piece spread groove 34 and certain length's bracing piece and connect, the length of bracing piece is confirmed according to the position of needing to survey the position and the requirement of hole sealing, and the lower extreme of bracing piece can be connected with the drill bit.

During the specific use, let the upper end of top connection 1 pass through the lower extreme of drilling rod spread groove 32 and drill string and be connected, let the lower extreme of bottom connection 39 pass through bracing piece spread groove 34 and certain length's bracing piece and connect, the length of bracing piece is confirmed according to the position that needs survey the position and the requirement of hole sealing, and the lower extreme of bracing piece can be connected with the drill bit.

When the double-plug packing pressure tester drills down in the engineering exploration horizontal drilling pressure test, slurry or clean water in holes sequentially passes through the drill bit, the supporting rod and the hollow part of the lower joint 39, the drainage channel 12 of the supporting tube 38, the lower spline sleeve 35 and the lower piston 37, the drainage channel 8 of the lower spline sleeve joint 33, the drainage hole 6 of the lower central tube 31, enters the lower central tube 31, the middle joint 30, the annular space of the sealing cavity 25 and the middle adjusting rod 29, the drainage channel 12 of the upper spline sleeve 9 and the spline shaft 11, the drainage channel 8 of the upper spline joint 7, the drainage hole 6 of the upper central tube 5, enters the inner cavities of the upper central tube 5, the upper joint 1 and the drill string, returns out of orifices of the drill rod, achieves the purpose of eliminating the back pressure of a drilling tool, prevents the top shear pin 10 from being cut off in advance, and enables the engineering exploration horizontal drilling pressure test double-plug packing pressure tester to smoothly reach a specified position.

When a double-plug packing pressure tester encounters resistance during drilling in an engineering exploration horizontal drilling pressure test, a drilling machine is used for rotating a drill rod column, torque is transmitted to a drill bit through an upper connector 1, a lower central pipe 31, a spline shaft 11, an upper spline sleeve 9, a middle adjusting rod 29, a middle connector 30, a lower central pipe 31, a lower piston 37, a lower spline sleeve 35, a supporting pipe 38, a lower connector 39 and a supporting rod in sequence, and the hole section which meets the resistance is expanded and swept until the drill rod can be smoothly put in, so that the aim of not lifting the drill in the midway is fulfilled, the auxiliary time of pressure measurement is shortened, and the efficiency of pressure measurement is improved.

When the double-plug packing pressure tester goes down to a designated position (at the moment, a drill bit connected with the lower end of a support rod props against the bottom of a hole) in an engineering exploration horizontal drilling pressure test, a drill string and a driving drill rod of a drilling machine are connected, the weight of the drill string or a cylinder of the drilling machine is used for pressurizing, the pressure is transmitted to a spline shaft 11 through the drill string, an upper joint 1, an upper central pipe 5 and a middle joint 30, a lower central pipe 31 and a lower piston 37, a top shearing pin 10, a middle joint 30, a lower central pipe 31 and a lower piston 37 are cut off, and the pressure passes through the drill string, the upper joint 1, a top guide ring 2, a rubber cylinder 3, a middle guide ring 4, an upper spline joint 7, an upper spline sleeve 9, a middle adjusting rod 29, a middle joint 30, a top guide ring 2, a rubber cylinder 3, a middle guide ring 4, a rubber cylinder 3, the top guide ring 2, a lower spline sleeve 33, a lower spline sleeve 35, a support pipe 38, The lower joint 39, the support rod and the drill bit prop against the bottom of the hole, and the rubber cylinder 3 is forced to axially compress and radially expand under the action of pressure and is tightly attached to the hole wall to seal and isolate the position to be measured of the drilled hole; the method comprises the following steps that when a rubber cylinder 3 is axially compressed, a drill string, an upper connector 1, an upper central tube 5, a spline shaft 11, a piston cover 15 (comprising an upper piston 13, a spring 14, a check screw cap 17, a check spring 18 and a check pin 16), a sealing cavity 25 (comprising a suspension pin 19, a sealing piston 23 and a sealing short section 20), a sealing end cover 27 (comprising an electronic pressure gauge 24), a middle connector 30, a lower central tube 31 and a lower piston 37 sequentially move downwards, a drainage hole 6 of the upper central tube 5 is sealed by the inner wall of the upper spline connector 7, a drainage hole 6 of the lower central tube 31 is sealed by the inner wall of a lower spline connector 33, and a through hole of the sealing cavity 25 is basically aligned with a through hole of an intermediate adjusting rod 29; at the moment, pressure mud or clean water is fed in through the hollow part of the drill string, the pressure mud or the clean water enters the inside of the spline shaft 11 through the upper joint 1 and the cavity of the upper central pipe 5, the upper piston 13 is compressed, the sealing short section 20 is pushed to move downwards, through holes in the sealing short section 20 and the sealing piston 23 are aligned, then pressure-bearing mud outside the middle adjusting rod 29 flows into a sealing cavity 25 provided with an electronic pressure gauge 24, the internal pressure and the external pressure are balanced, and pressure relief is completed; after the pressure relief is finished, quantitative slurry or clean water is fed into the position to be measured (namely the position sealed by the rubber cylinder 3) of the drill hole through the upper part of the upper piston 13 and the axial alignment through hole of the spline shaft 11, and the slurry or the clean water also enters the sealing cavity 25 through the alignment through hole and is recorded with the pressure data by the electronic type downhole electronic pressure gauge 24, so that the purpose of measuring the pressure is achieved.

After pressure measurement is completed, axial pressure is relieved and the drilling tool is lifted properly, the rubber tube 3 is rapidly recovered, the upper joint 1, the upper central tube 5, the spline shaft 11, the piston cover 15 (comprising a spring 14, a check screw cap 17, a check spring 18 and a check pin 16), the sealing cavity 25 (comprising a suspension pin 19, a sealing piston 23 and a sealing short section 20), the sealing end cover 27 (comprising an electronic pressure gauge 24), the middle joint 30, the lower central tube 31 and the lower piston 37 move upwards in sequence, the drain hole 6 of the upper central tube 5 is communicated with the drain channel 8 of the upper spline joint 7, and the drain hole 6 of the lower central tube 31 is communicated with the drain channel 8 of the lower spline sleeve joint 33; at this time, the drill is lifted, slurry or clean water in the drill rod sequentially passes through the drill string, the upper joint 1, the inner cavities of the upper central tube 5, the discharge hole 6 of the upper central tube 5, the discharge channel 8 of the upper spline joint 7, the discharge channels 12 of the upper spline housing 9 and the spline shaft 11, the annular space of the seal cavity 25 and the intermediate adjusting rod 29, the middle joint 30, the inner cavity of the lower central tube 31, the discharge hole 6 of the lower central tube 31, the discharge channel 8 of the lower spline sleeve joint 33, the discharge channels 12 of the lower spline housing 35 and the lower piston 37, and the inner cavity of the supporting tube 38, enters the hollow cavities of the lower joint 39, the supporting rod and the drill bit, and is supplemented into the drill hole, so that the suction effect of the drill is eliminated, and the damage to the drill hole is reduced.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the utility model can be made, and equivalents and modifications of some features of the utility model can be made without departing from the spirit and scope of the utility model.

Claims

1. The utility model provides an engineering reconnaissance horizontal drilling water-pressure test double plug seals separates pressure apparatus, separates biography torsion mechanism, earial drainage intercommunication way, pressure measurement mechanism, seals down and separates mechanism and release mechanism, its characterized in that including last: go up to seal and separate biography torsion mechanism and include top connection (1), go up center tube (5), go up spline joint (7), go up spline housing (9), top shear pin (10), integral key shaft (11), the bottom of top connection (1) and the top threaded connection of last center tube (5), the bottom of going up center tube (5) and the top threaded connection of integral key shaft (11), the bottom threaded connection of going up center tube (5) has last spline joint (7), the bottom threaded connection of going up spline joint (7) has last spline housing (9), go up spline housing (9) and be connected through spline connection structure and integral key shaft (11), just spline connection structure is fixed a position by top shear pin (10), release mechanism includes piston (13), spring (14), piston lid (15), non return round pin (16), non return spiral shell lid (17), non return spring (18), The sealing device comprises a suspension pin (19), a sealing short section (20), a sealing piston (23), a sealing cavity (25), a sealing end cover (27), an intermediate adjusting rod (29) and an intermediate joint (30), wherein an upper piston (13) is sleeved at the bottom of an inner cavity of the spline shaft (11), a spring (14) is sleeved on the surface of the upper piston (13), the top end of the intermediate adjusting rod (29) is in threaded connection with the bottom end of an upper spline sleeve (9), the bottom end of the intermediate adjusting rod (29) is in threaded connection with the top end of the intermediate joint (30), the bottom end of the spline shaft (11) is in threaded connection with a piston cover (15), the bottom end of the piston cover (15) is connected with the sealing piston (23), a radial hole (21) is formed in one side of the piston cover (15), and a non-return pin (16), a non-return screw cover (17) and a non-return spring (18) are sequentially installed in an inner cavity of the radial hole (21), the bottom end of the upper piston (13) is connected with a sealing short section (20) through a suspension pin (19), the bottom end of the sealing piston (23) is connected with a sealing cavity (25) through threads, the bottom end of the sealing cavity (25) is connected with a sealing end cover (27) through threads, the sealing piston (23), the sealing cavity (25) and the sealing end cover (27) enclose a cavity, an electronic pressure gauge (24) is fixedly mounted inside the cavity and at the top of the sealing end cover (27), the lower packing mechanism comprises a lower central tube (31), a lower spline sleeve joint (33), a lower spline sleeve (35), a bottom shearing pin (36), a lower piston (37), a supporting tube (38) and a lower joint (39), the bottom end of the middle joint (30) is connected with the lower central tube (31) through threads, the bottom end of the lower central tube (31) is connected with the lower spline sleeve (35) through threads, and the bottom end of the lower spline sleeve joint (33) is connected with the lower spline sleeve (35) through threads, spline housing (35) and lower piston (37) pass through spline connection structural connection down, just spline connection structural connection passes through bottom shear pin (36) location, the bottom of spline housing (35) is connected with stay tube (38) down, the bottom of stay tube (38) is connected with lower clutch (39), the surface of going up center tube (5) and the surface from the top down of center tube (31) have cup jointed top and have led positive ring (2), rubber tube (3) and well and lead positive ring (4) in proper order down.

2. The double-plug packing pressure tester for the engineering investigation horizontal borehole water-pressure test according to claim 1, characterized in that: the inner side of the rubber cylinder (3) is provided with an inwards concave spherical cambered surface (22), and the outer side of the rubber cylinder (3) is provided with a steel wire mesh.

3. The double-plug packing pressure tester for the engineering investigation horizontal borehole water-pressure test according to claim 1, characterized in that: the blowdown intercommunication way comprises discharge hole (6), blowdown passageway (8) and blowdown way (12), blowdown hole (6) have all been seted up to one side of going up center tube (5) and one side of center tube (31) down, blowdown passageway (8) have all been seted up to one side of going up spline joint (7) and one side of lower spline socket joint (33), one side of going up spline housing (9) and lower spline housing (35) is provided with six key internal splines (26), one side of integral key shaft (11) and lower piston (37) is provided with three key external splines (28), blowdown way (12) are formed by six key internal splines (26) and three key external splines (28) cooperation.

4. The double-plug packing pressure tester for the engineering investigation horizontal borehole water-pressure test according to claim 1, characterized in that: through holes are formed in the middle of the spline shaft (11), one side of the middle adjusting rod (29), one side of the sealing piston (23) and one side of the sealing short section (20).

5. The double-plug packing pressure tester for the engineering investigation horizontal borehole water-pressure test according to claim 1, characterized in that: and a drilling fluid channel is formed in one side of the top of the upper piston (13).

6. The double-plug packing pressure tester for the engineering investigation horizontal borehole water-pressure test according to claim 1, characterized in that: the top end of the upper joint (1) is provided with a drill rod connecting groove (32), and the bottom end of the lower joint (39) is provided with a support rod connecting groove (34).